To create accounts for retail vendors, you can check the box within the contract screen to set an account to be a vendor. This tracks 100% of the sale price instead of the normal split %. You won't be physically paying these accounts out but many stores "pay them out" in the system at the end of the year to start fresh for sales tracking the following year.
When you update a consignor contract split, Rose will ask if you want to apply that new split to all existing inventory. This will override any and all splits currently set for that vendor's inventory.